What is GoFundMe's business model?

I'm curious to understand the fundamental workings of GoFundMe's business model. Could you please explain in simple terms how they generate revenue and sustain their operations? Specifically, I'm interested in knowing if there are any fees involved for both donors and campaign creators, and how GoFundMe ensures trust and transparency in their platform? Also, what strategies does GoFundMe employ to attract and retain users, as well as maintain a strong brand reputation in the crowdfunding space?